made in a digital input. The default digital input is DI3. You can also program the response
data into a relay output.
P3.9.1.14 RESPONSE TO SAFE TORQUE OFF (STO) FAULT (ID 775)
This parameter defines the response for F30 – Safe Torque Off (Fault ID: 530).
This parameter defines drive operation when Safe Torque Off (STO) function is activated (e.g.
emergency stop button has been pressed or some other STO operation has been activated).
0 = No action
1 = Alarm
2 = Fault, stop according to defined stop function P3.2.5 Stop Function
3 = Fault, stop by coasting
9.9.1 MOTOR THERMAL PROTECTIONS
The motor thermal protection prevents the motor from becoming too hot.
The AC drive can supply a current that is higher than the nominal current. The high current
can be necessary to the load, and it must be used. In these conditions, there is a risk of a
thermal overload. Low frequencies have a higher risk. At low frequencies, the cooling effect
and the capacity of the motor decrease. If the motor has an external fan, the load reduction
at low frequencies is small.
The motor thermal protection is based on calculations. The protection function uses the
output current of the drive to know what is the load on the motor. If the control board is not
energised, the calculations are reset.
To adjust the thermal protection of the motor, use the parameters from P3.9.2.1 to P3.9.2.5.
You can monitor the thermal status of the motor on the display of the control panel. See
Chapter 3 User interfaces.
NOTE!
If you use long motor cables (max. 100 m) with small drives (≤1.5 kW), the motor
current that the drive measures can be much higher than the actual motor current.
It is because there are capacitive currents in the motor cable.
CAUTION!
Make sure that the airflow to the motor is not blocked. If the airflow is blocked, the
function does not protect the motor, and the motor can become too hot. This can
cause damage to the motor.
P3.9.2.3 ZERO SPEED COOLING FACTOR (ID 706)
When the speed is 0, this function calculates the cooling factor in relation to the point where
the motor operates at a nominal speed without external cooling.
The default value is set for conditions where there is no external fan. If you use an external
fan, you can set the value higher than without the fan, for example at 90%.
If you change parameter P3.1.1.4 (Motor Nominal Current), parameter P3.9.2.3 is
automatically set to its default value.
VACON · 276 PARAMETER DESCRIPTIONS
9
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